How do I use a custom JAR?
Stop your server and choose Custom JAR in the Server Type dropdown menu
Navigate to the Files>FTP File Access tab of the panel
Enter your control panel password in the Multicraft Password box and click Login
Click Upload in the sidebar
Click Choose File and select the server JAR file you downloaded to your computer
If the JAR file size exceeds 16 MB, you will need to use an FTP program such as FileZilla to upload the file to your server.
Go back to your server files and click the checkbox to the left of the file you just uploaded
Click rename and rename the file to custom.jar
Click submit
Start your server
Updated on: 08/23/2019
Thank you!